I have been thinking this for a while and I think it would be easier to emulate a touch on the screen via software (so it could be set to run with a key press or shortcutd)? I did a little research and found this http://forum.chumby.com/viewtopic.php?id=4585 . I tried to do something similar doing as root:
left it running, touched the top left corner, back to xterminal and ctrl+c to stop it and seems to work as expected, but when I try
I get "Permission denied".

I'm guessing new drivers might be needed.
Does anybody know how to get this to work?